<!DOCTYPE html>
<html>

<head>
	<meta charset="utf-8">
	<title>两栏自适应布局</title>
	<style type="text/css">
		.left {
			width: 200px;
			height: 400px;
			background: lightblue;
			float: left;
			display: table;
			color: #fff;
		}

		.right {
			margin-left: 210px;
			height: 400px;
			background: #FFAAFF;
		}
	</style>
</head>

<body>
	<div class="left">定宽</div>
	<div class="right">自适应</div>
</body>

</html>